Corner piece for a frame



FIG. 1 is a top front perspective view of the corner piece for a frame showing my new design.

FIG. 2 is a left side elevation thereof.

FIG. 3 is a rear view elevation thereof.

FIG. 4 is a right side elevation thereof.

FIG. 5 is a bottom view thereof. 

The ornamental design for a corner piece for a frame, as shown and described. 